#pragma once
#include <functional>
#include <unistd.h>
#include <string>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "nocopy.hpp"
#include "Log.hpp"
#include "InetAddr.hpp"
using namespace hcc;

const uint16_t glocalport = 8888;
const int gsockfd = -1;

using func_t = std::function<std::string(std::string)>;
enum
{
    SOCKET_ERROR = 1,
    BIND_ERROR
};
class UdpServer
{
public:
    UdpServer(func_t func, uint16_t localport = glocalport)
        : _localport(localport),
          _sockfd(gsockfd),
          _isrunning(false),
          _func(func)
    {
    }
    void InitServer()
    {
        // 1.创建套接字 fd
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(INFO, "创建套接字失败\n");
            exit(SOCKET_ERROR);
        }
        LOG(DEBUG, "socket create success , _sockfd: %d\n", _sockfd);

        // 2.绑定
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_localport);
        local.sin_addr.s_addr = INADDR_ANY;
        int n = ::bind(_sockfd, (struct sockaddr *)&local, sizeof(local));
        if (n < 0)
        {
            LOG(FATAL, "bind error\n");
            exit(BIND_ERROR);
        }
        LOG(DEBUG, "socket bind success \n");
    }
    void Start()
    {
        _isrunning = true;
        char inbuffer[1024];
        while (_isrunning)
        {
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, (struct sockaddr *)&peer, &len);
            if (n > 0)
            {
                InetAddr addr(peer);
                inbuffer[n] = 0;
                std::cout << "[ " << addr.Ip() << " : " << addr.Port() << " ] : " << inbuffer << std::endl;

                std::string result; //="udp_server echo] # ";
                result += _func(inbuffer);
                sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr *)&peer, len);
            }
            else
            {
                LOG(INFO, "recvfrom error\n");
            }
        }
    }
    ~UdpServer()
    {
        if (gsockfd < _sockfd)
            ::close(_sockfd);
    }

private:
    int _sockfd;
    uint16_t _localport;
    // std::string _localip;
    bool _isrunning;

    func_t _func;
};